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> TeX in ALT by default is necessary to make it look readable in text
browsers.
> It is the only possibility, as readable ascii-arts would have to be
> two-dimensional and ALT doesn't support such thing.

Sorry, I thought for a second that they could be two dimensional, becuase
the formula I was looking at was so long that it ran on the the next line in
the IE6 tooltip.

I've always thought IE's and Navigator's handling of ALT text was flawed,
and that it should be much more discreet than a tooltip popping up. And
perhaps we do owe users of text browsers a little more courtesy than
expecting them to find the appropriate user preference before they can see
formulas. However, I think it's our job to work around browser problems,
rather than ignore them.

Perhaps we could put in a JavaScript browser test, and strip the ALT text
for browsers recognised as graphical, such as IE and Navigator. The handful
of rebellious users who use a graphical browser with the pictures turned off
can just turn them back on, or find the user preference I suggested.